Rule 1 for this journey, unless your children are very good travellers: keep as far as possible to Motorways and Roman Roads. My young son seemed to be sick at every bend on traditional roads.Rule 2 is to keep them occupied. Word games like I Spy, and singing. You could try teaching them Shanties, but any songs you know. Best of all, ones that can be extended indefinitely like "Old Macdonald had a farm". And in your case, Norwegian folk songs.Don't even think of having a quiet time in the front with the children in the back.